使用从mediastore.audio.media.data提取的uri删除文件

Question

    Uri uri= MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    String selection=MediaStore.Audio.Media.IS_MUSIC+"!=0";
    Cursor c=getContentResolver().query(uri,null,selection,null,null);
    if(c!=null)
    {
        c.moveToFirst();

        do {
            String audioName=c.getString(c.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
            String artist=c.getString(c.getColumnIndex(MediaStore.Audio.Media.ARTIST));
            String album=c.getString(c.getColumnIndex(MediaStore.Audio.Media.ALBUM));
            String url=c.getString(c.getColumnIndex(MediaStore.Audio.Media.DATA));
            String size=c.getString(c.getColumnIndex(MediaStore.Audio.Media.SIZE));

            audioInfoArrayList.add(new AudioInfo(url,audioName,artist,album));

        }while (c.moveToNext());

        c.close();

Uri uri= Uri.parse(audioInfo.get(position).getUrl()); //its actually returning the url stored above in string form
deleteFile(uri.getPath());
Log.i("logText","uri.getPath() : "+uri.getPath());
Log.i("logText","audioInfo.get(position).getUrl() : "+audioInfo.get(position).getUrl());

public void deleteFile(String filePath){
    if(filePath.startsWith("content://")){
        ContentResolver contentResolver = context.getContentResolver();
        contentResolver.delete(Uri.parse(filePath), null, null);
    }else {
        File file = new File(filePath);
        if(file.exists()) {
            if (file.delete()) {
                Log.e("logText", "File deleted."); //condition 0
            }else {
                Log.e("logText", "Failed to delete file!");  //condition 1
            }
        }else {
            Log.e("logText", "File not exist!"); //condition 2
        }
    }
} 

01-11 13:52:34.257 19982-19982/com.example.hp.myplayer E/logText: Failed to delete file!
01-11 13:52:34.257 19982-19982/com.example.hp.myplayer I/logText: uri.getPath() : /storage/emulated/0/bluetooth/Copy Copy Fireflies-Owl_City[www.Mp3MaD.Com].mp3
01-11 13:52:34.257 19982-19982/com.example.hp.myplayer I/logText: audioInfo.get(position).getUrl() : /storage/emulated/0/bluetooth/Copy Copy Fireflies-Owl_City[www.Mp3MaD.Com].mp3

注意：在调用deleteFile（）时，执行条件1，而不是2或0，根据我的说法，这意味着使用存储中的uri定位文件，但不能删除，并且file.delete（）返回false。

Answer 1

在manifest中请求读写外部存储权限对于Android6及以上版本是不够的。

您应该添加代码来要求应用程序的用户确认所请求的权限。

运行时权限的谷歌。